MTD (
Swedish abbreviation for ''Mobiltelefonisystem D'', or ''Mobile telephony system D'') was a manual
mobile phone
A mobile phone, cellular phone, cell phone, cellphone, handphone, hand phone or pocket phone, sometimes shortened to simply mobile, cell, or just phone, is a portable telephone that can make and receive calls over a radio frequency link whi ...
system for the 450 MHz
frequency band. It was introduced in 1971 in
Sweden
Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic countries, Nordic c ...
, and lasted until 1987, when it was made obsolete by the
NMT automatic service. The MTD network had 20,000 users at its peak, with 700 people employed as phone operators.
MTD was also implemented in
Denmark
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and in
Norway
Norway, officially the Kingdom of Norway, is a Nordic countries, Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of ...
(from 1976), which allowed roaming within the
Scandinavian countries.
MTA
In Sweden, the first mobile phone system was MTA (for ''Mobiltelefonisystem A''), which was introduced in 1956, and lasted until 1967. It was a 160 MHz system available in
Stockholm
Stockholm () is the capital and largest city of Sweden as well as the largest urban area in Scandinavia. Approximately 980,000 people live in the municipality, with 1.6 million in the urban area, and 2.4 million in the metropo ...
and
Gothenburg
Gothenburg (; abbreviated Gbg; sv, Göteborg ) is the second-largest city in Sweden, fifth-largest in the Nordic countries, and capital of the Västra Götaland County. It is situated by the Kattegat, on the west coast of Sweden, and has ...
, with 125 total subscribers. The second system, MTB (for ''Mobiltelefonisystem B''), had
transistor
upright=1.4, gate (G), body (B), source (S) and drain (D) terminals. The gate is separated from the body by an insulating layer (pink).
A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch ...
ized mobile sets, was introduced in 1962, and lasted until 1983. It operated in the 76–77.5 and 81–82.5 MHz bands, was also available in
Malmö
Malmö (, ; da, Malmø ) is the largest city in the Swedish county (län) of Scania (Skåne). It is the third-largest city in Sweden, after Stockholm and Gothenburg, and the sixth-largest city in the Nordic region, with a municipal popul ...
, and had around 600 subscribers.
OLT
In Norway, the first mobile phone system was
OLT
Olt or OLT may refer to:
People:
* Károly Olt (1904–1985), Hungarian politician
* Mike Olt (born 1988), American baseball player
Places:
* Olt County, a county (județ) of Romania
* Olt (river), a river in Romania
** Olt Defile, a defile t ...
, introduced in 1966. In 1976, the OLT system was extended to include
UHF
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (on ...
bands, incorporating MTD, and allowing
international roaming within Sweden.
External links
Brief description of MTD as well as MTA and MTB
Some history behind MTA and MTB (latest snapshot at the Internet Archive)
*
{{DEFAULTSORT:Mtd (Mobile Network)
Mobile radio telephone systems